Pronunciation: (pol'ip),[key] —n. 1. Zool. a. a sedentary type of animal form characterized by a more or less fixed base, columnar body, and free end with mouth and tentacles, esp. as applied to coelenterates.
b. an individual zooid of a compound or colonial organism.
2. Pathol.a projecting growth from a mucous surface, as of the nose, being either a tumor or a hypertrophy of the mucous membrane.